The epithelial tissue is classified based on the number of layers that they possess and their shape.
For the number of layers; If the number of layers, n=1 then it is simple. If the number of layers, n>1, then it is striated. For pseudostratified(pseudo means false), it is actually a single layer, that 'appears' like as if it has more than one layer.
For the shape; Squamos(from the Latin word squama which means scale) describes flat, thin epithelial cells. Cuboidal describes epithelial cells that have a cube-like shape. Columnar on the other hand describes tall, elongated cells with a stretched nucleus.
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